Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fed5c786c1e6b188cd178f40d94a9a57a0aa1bdd0e04d74bc6b9d49d3f305544' 
  AND token = 'kkQoyPzUV81v4ih5bh4oqcEArASJsAJE/D+WytvK1Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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