SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c09f0b10ef8dda773db7899a92a8a5ef9894243c83c94291ac5c7dae581db7f' 
  AND token = 'VYppz5G5EKJzL3j+DgoWnJukGbgmIdMKycJQPKNfUEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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