SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0779f5a1ab8934275a36d5af7064bb4a4b06032ae46fe697a4273c8da76ff3b0' 
  AND token = 'E8heWSpFlH+mG/3YSh7BAvLyPlOMretJVJL8DbzToAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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