SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ece3ca61f4f3822fc089ed078a10b4df386505ac25845820f9794f3c11abcae4' 
  AND token = 'AazLYAwpgAK7jSXYsrQc7gaZlG1/6XNHvzYpA18ULTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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