SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58d2f11d0eb660adb07d80503afc5d5e3f897155b784674869b789364880b953' 
  AND token = 'Qzlq9LQGTRNN/T4KVRlJYxqiwQh/9gvyLCCOTDAzNbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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