SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ceb63afd84969921861c1f5d1db9edbc24b36fc9b1f9943c27043a9e8d2ac781' 
  AND token = 'Bh0UufYTjiS0/3spmOzkaj/v50HJ+hUgnwst5lRBcXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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