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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b638a66e2699a585064e15a41f97e7492653e1ea46830530ca2a92aa918f56e' 
  AND token = 'XuD2S7z2UukBjW73DXD0WVibyUhODEDdiIlmUSPb8H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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