SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac19a6df38b7f35dd4f07cd89a0cdf28467cb3d0679171b0659ec4194731bc40' 
  AND token = '/jH/GBmstMrBZVZI0g5wyJFTxfb7MK0GaSGgXS5VHhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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