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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c598dc5bdc020ca4ca1805a6a2c3db8482fd272bc9b7aba9f2847349fd3690d1' 
  AND token = '1FtECOWmf0mS7cRrR9J3stWpw1hQ96OYjaT0i+lOZbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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