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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '990403e88206f7303c6140f97d46d528a155de5aa3940fa7b9a2ea305c125cbd' 
  AND token = 'GS22HA0H6YHx4595SpjQdWgngyX6iYCbctALJ4WaW/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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