SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77d1654a469521808e4fb160bf806cda92bfc38ad67e78be450bc31a99c5e247' 
  AND token = 'fvZSIZQIdm6Q3gEaQ2Zh8NpY5o/uhKxYX3D9jcCIp3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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