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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebb304a0efdcd010d62b28c1cc33aebd202516624d649c6e6f3c5b40c7e8fe48' 
  AND token = 'ZfmFcKILWLMqC2D6olFqkgo/yP1jqDfi5+N5rTPGd0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}