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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3181278f3ae998c2cf1480c87af003f23e2a51c1dd6a96e3e65b94b83b82441c' 
  AND token = '9DyWD1j4ubdQTw77t8o/lo5/97MiUAjPdalTfoqw5Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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