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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '530be644468a08f04fc7763767cb589368542ef060c952db4ba3603460b63755' 
  AND token = '6BFOM71foh6YLUanxmFR7BEPKm/dIHJcUKiF/nw/Pi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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