Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbf51c20b548fdfa0b5accde07da9732c81cd4aa5ddd4c2fad9569c6badcdcd6' 
  AND token = 'c1gVifUuveb4TTGXPsRlDmEMb2s1FqoubFAnxoJRmTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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