SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f535a8db9c91ef4785e0c9952f67179c6f654c126cb4aff18ea8cebdd3813bf' 
  AND token = 'EwFv7Zc3ZZprwSE+EqJR8QiZWChw3p0QtMTLkzYhp7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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