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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16a761655e83383e64c6d95f020c65f6b86c0a6af9c10cc08614b445c0496be4' 
  AND token = 'p67bQP5L1a+coWb/KmMu5cb4b3hB1tYuQ31l4Gxcu4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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