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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a422ac964bf69d3f54f96e2c5a6b4e6fcb1dcfd7640e7e5915564f4c561ed1af' 
  AND token = 'J9u1YxqXXU+N7kk1aancHh14LTXMkl+1O9vm8l/8nqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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