SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd46f67e55489cc2fbb3a893d448b42a3f50bafa1b1d2fef228b7e92653d82469' 
  AND token = 'yGtiTvnfxvGu3HeGJpCqeLAGEBRVrmP+Wk/uWbcT7Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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