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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '272d1c42eb9bba59a75966a85f93942d10c0c9cff64e2653e858a9d7e67137f8' 
  AND token = 'KRBBB8ubnuWOH5RW/urnlejrckz+6sJcmXzcjrRBG28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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