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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f054b50f9e7bd1d9621764af2fe36bcc00511f278586345576e9a1c8038c8ac' 
  AND token = 'cuPyX1ERqT9/uNNDU3S7Uw1caWjh/1A7qNDTIKnyQbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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