SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd99483d0b3aabcf1b55462ca452b386e0b92a333851b693d1b61f16a78108335' 
  AND token = 'FfMi7mUx8ZxgEVLeGg9h+hMp6OBbUvow1/juPUs2LfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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