SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e8da082581dfb92dd7d39bf3648259fd56638555c3830474fca24fb2d765f89' 
  AND token = '08PIIkY4zgt60MEABgQYGn7yY1Ai2+GwBUYVi1xmavs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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