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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49a7e10574d3c683e1f126b39dc6c2aa76d5acd9153e513358ddd5e18012e6d7' 
  AND token = 'onZWweM4tLgCGHeq9oKOKcErudoKlFJwMq4iHDwjyDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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