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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84a4b169b9faa5bd85573e17907d8c25b8ed449905cda6e0c8d9dd62ef7c1fd1' 
  AND token = '5t7K5qwBRVT4FsINKnp2q+Xu/Hio6UAyR8sE89f6EA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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