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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfe9a9db3e367f4c96d8734a774d520823d4a0271161e75404c71b762d28a8ae' 
  AND token = 'CkyS5kCvNcDRVvxtQhHRbBeTAjAkRJBTUikibZ3R5A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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