SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e7bb679174b190913dc87dc864a30491e3164fa0f238d03cc4c3019fdea2f50' 
  AND token = 'lWQ0l4jFtjoKTvSuNcUIAjB8vR4guGapcBYZSOPnSbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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