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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad34e8ccacce65653d6be5ffcbb43afb9cc9b957bb3a469b84b8d5a6959e69f9' 
  AND token = 'aCi3I7nYNYikAYdR3/inimVrNwyNNfyPDlmqlTI8Jac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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