SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ec59bd562ed5e3abd8049eb472d1d81c666f35982b07110a4ecc7a106e6b488' 
  AND token = 'XXZxT9fcUDK0jWq4GNy+FMpjAYSPGq6aPBR6npsvrH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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