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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ada0373fb9ae47f1fd803933fdbce0abb28076503212bc6b37b29d058c65fe3' 
  AND token = '5UEU2DCyRaw0XAW8ZiBILI5QwBHrOoiCaOukw+x9chY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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