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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cad7ef588e63930a2ca1e38585bee6e476a7c5ba44b4f2dd723743b26526755c' 
  AND token = 'Nbjoz4h7UO6n3UwoTOTdfFs4tDLQeK00qYVgYwhOgrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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