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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ead35f2ea40c8d8b8dc94aae86ab2974e314a8c51da389ee57e0b02a89b75a0f' 
  AND token = 'sMRxlFjpkXnnMNj+CWSjWs6dmA3QgeBgfAAEJfIgFNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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