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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3ab1f8ae311baf2bddb14e3e65d8a85f178274e962c49de2cf66798dd49d1da' 
  AND token = 'ob1AByKXy3zlqF5Ee2uZOpEUZZrjb6WQY3DhaOn5/f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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