SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65b391b71f2448936864fcad250c702146a8eb9f5bc30250b2170d578c4e2d74' 
  AND token = '3dObUDY+6FD/b15AkVKSYmqnnB3s76fzQJxFaYJU/DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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