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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '898953acce5ff3c70cbc6d73f49a8122547e0f45af31c1aebde5a69cfeb82019' 
  AND token = '1Yh3iR70yvHRPtE51sbpuMTaKhB3PfaweWJ9UXS7HlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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