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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3cb2a95178fcf0090f983a325830a873f2d80f02c07f3bdad8feca64819ee7e9' 
  AND token = 'bj1Om4zZuGOWMlh8RvoiMdN7hXwWFJv/8xt5yh5xDdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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