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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '979d4f68830b2aa215997ab789f7960276b344faf07d2bd166d7fc8708732974' 
  AND token = '0WLpufiXDSfQNYNqhRDdbhUs7MSPA8dl2VONlBauPFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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