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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f207d0a3950e6cc1f59692ffaa78195722918c78e18c7a043701a0cc49ef3f54' 
  AND token = 'YTuDU2dVYOp29RmXG8iwU4xJrEloNVfz+UCK4WVSyfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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