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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e68a531ce888060d139e271d6e2ecb7d498d32edc1c009176a87301f8bdbf9c1' 
  AND token = '9a9yuMrnGF4KK2AuPCs1vi+rfhOZZbPjlsmRarKVz30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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