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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b413a0ff2684c6e987e903b2ffb00dcf875942e956d9d5d81c530344293e1259' 
  AND token = '2ykkICa1hEPVytyXQ9Z0mQld3uP1yI6snV7CUZ4iTVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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