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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d1ba3794505e4b26123d427f3ec6d23987d293ed715c72f0a4adf5f231d06dc' 
  AND token = 'K2hla+mkatJVanKRVi4YkSi0ItQNJpwA9ivdUheUb7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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