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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8aa2c37090dc5a96e55f51b329b18650bb03a16dd02a9475cac7bab4598b4359' 
  AND token = 'oEUSPprh1Do5RCIzjWAa5xJ2Kasj2uka+8BQMFOiP5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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