SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76f886f07b43748d5cea319512a689d2a12df2b2fa16bcf5dcc0fcdcd0d58605' 
  AND token = '3UJDSpLwXrTePLWBS50rmq/64SHf2KAKqYCTFZj5Ybg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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