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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d744d083f3b6740350a6f1731f8ac77e7dd883120a95a0aa59bdf6d5bc1187d' 
  AND token = '1wQUvmcsCZlOl5xGwn4hgNRUdkFgOpKaSMSIKanUtdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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