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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19ffd9e9de7a71101fa1ccc0d314954df65f01bd0df100c8a1580df694b6cd1b' 
  AND token = 'Utozz9YKYJD38lNK2IPUGVW4tnLXj6MQIjZ/cE/5ELc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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