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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '460682c50ea007f561b11a3b188e5ea64cf8d7b8bb37adeff3f7143f5ffea43a' 
  AND token = '4jfFP9xuBQUH9YPOhTC5VzW8PR8hutTUi+NxRzMS4lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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