SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebdde35f16bf81adc1a8460fed0a58a20fc3bcf3e45fbfda59cc8991b7e8dd29' 
  AND token = 'Sl3yx/h+kVvEJPp0i20wwZ/pKD1V+MoI0c7IR8uh3Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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