SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa6234f240ea2d37f7b52817c0f6b3eb6ec5d7f0bfdeb51d1a37158069869d9d' 
  AND token = 'I0zvhRnbWDZ3Rv96fq3iXoogjFKUGEsveyVm6x1eUE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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