SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc26d3368d61e970259427b25007b0b4b174d6973b1ceb5622a2f6bf788145e3' 
  AND token = '0ODY2gUMIPQjhJcKxeKt1BjpohvRrP80ngeVJMfru2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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