SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '853359d54d9eed55e34ac0be8ba4995218ece6fa9871adf9d3094c02f61f7c51' 
  AND token = 'G3uzfPIP9BF3uPaOzi6+S9q/nZ9TbTweeCYhsJs4CqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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