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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '099ddf68c832fdf17c8e3284823e3e6122d3585af637ff6a71cfd8852f18bbd7' 
  AND token = 'fMlp1wEsmQxdbGkDWxsw6M5KkAI4ff0PEsoaPEiOdzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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