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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8de88ba6e1053ae47351a0f473c8567bbb6120b5798082c52a67d49f053c02f2' 
  AND token = 'S3kY5MVVUBI7NeF1CkULZ6NW6GnuvC4O5T+UC/63/nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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