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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c3cf36b43ebda891d8f203f3795c28aa26c34517c114ff0efb845c573744dd2' 
  AND token = 'SlhxyNDKzXGLNAdH6tLEYOxFm67PdAbba9qUNyavuH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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