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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'deba0c58018103ff800cdcd493c4a6306b3b2cedbb2dd7ba6ea005c90b646599' 
  AND token = 'tgyMS4Q7aqQwrnL+A9jMN9v19h/cLgWHv9zh5xjS8D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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