Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3155fadb28d924e52b40dbbf54c42a8caa3590ad345729d307a4cc964e10a50' 
  AND token = 'LxyFIzSVwfVhxfBiLsDKKeYFpEpDf0/td9DcPClIL+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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