SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71c3ed4fc5cb5e76e7d4d089f4462709a48c46771a8893fa80065d4c64e5bb5e' 
  AND token = 'NrPGYZvUlwNpC/dy/lSIh5wOlLaBrbIHmUjkiLQ4dFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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