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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '193ee73115265aee2773e1a38a92b86de50369fe7ea7bda46b8df5ac17b00a6a' 
  AND token = 'kwotMlAr3XCNFgBcdZIc/DSYPVUA75bbk2D4koyUcYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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