SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b2f04a3ed0e2aa9d3788cafe577b7134f0c18eca32bf4406675c4123dd12e5d' 
  AND token = 'Vh123aMHuubwWEb+YByQ85oVXjYzS6Y2BumdAqwDVQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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